Synthesis of starch‐based flocculant by multi‐component grafting copolymerization and its application in oily wastewater treatment

Liu, Xiwen; Guo, Qiaoxia; Ren, Shenyong; Wei, Chongbin; Chang, Jiaxin; Shen, Baojian

doi:10.1002/app.53356

Cited by 5 publications

(4 citation statements)

References 64 publications

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“…Flocculation is a form of coagulation, when fine suspended dispersed particles in a liquid or gaseous medium form loose flocculated clusters, i.e., floccules. Natural [36,37] and synthetic water-soluble polymers [38,39] and their polycomplexes [40,41] are used as flocculants for raw water treatment.…”

Section: Coagulation and Flocculationmentioning

confidence: 99%

Review of Slow Sand Filtration for Raw Water Treatment with Potential Application in Less-Developed Countries

Abdiyev

Azat

Kuldeyev

et al. 2023

Water

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Providing safe drinking water to people in developing countries is an urgent worldwide water problem and a main issue in the UN Sustainable Development Goals. One of the most efficient and cheapest methods to attain these goals is to promote the use of slow sand filters. This review shows that slow sand filters can efficiently provide safe drinking water to people living in rural communities not served by a central water supply. Probably, the most important aspect of SSF for developing and less-developed countries is its function as a biological filter. WASH problems mainly relate to the spread of viruses, bacteria, and parasites. The surface and shallow groundwater in developing countries around urban areas and settlements are often polluted by domestic wastewater containing these microbes and nutrients. Thus, SSF’s function is to treat raw water in the form of diluted wastewater where high temperature and access to nutrients probably mean a high growth rate of microbes and algae but probably also high predation and high efficiency of the SSF. However, factors that may adversely affect the removal of microbiological constituents are mainly low temperature, high and intermittent flow rates, reduced sand depth, filter immaturity, and various filter amendments. Further research is thus needed in these areas, specifically for developing countries.

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Section: Coagulation and Flocculationmentioning

confidence: 99%

Review of Slow Sand Filtration for Raw Water Treatment with Potential Application in Less-Developed Countries

Abdiyev

Azat

Kuldeyev

et al. 2023

Water

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show abstract

“…Flocculation is a form of coagulation, when fine suspended disperse particles in a liquid or gaseous medium, form loose flocculated clusters, i.e., floccules. Natural [35,36] and synthetic water-soluble polymers [37,38] and their polycomplexes [39,40] are used as flocculants for raw water treatment.…”

Section: Coagulation and Flocculationmentioning

confidence: 99%

Review of Slow Sand Filtration for Raw Water Treatment with Potential Application in Less-Developed Countries

Abdiyev¹,

Azat²,

Kuldeyev³

et al. 2023

Preprint

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Providing safe drinking water to people in developing countries is an urgent world-wide water problem and a main issue in the UN Sustainability Goals. One of the most efficient and cheapest methods to attain these goals is the use of slow sand filters. Slow sand filters can efficiently provide safe drinking water to people living in small rural communities not served by central water supply systems. The purpose of this review article is to critically summarize and synthesize features and advantages of slow sand filtration methods to improve the quality of drinking water with special focus on less-developed countries. Even though slow sand filtration is an old technique, its efficiency and cost-effectiveness make it important to continue to develop the method in parallel to other chemical and biological methods. Thus, there are needs to continue to develop methods for slow sand filtration combined with simple disinfection techniques for treatment of microbiological pollutants such as bacteria, microbes, viruses, and parasites. These techniques can be applied before or after the sand filter application. Studies are also needed to investigate other types of porous material in areas where suitable sand and gravel are not readily available. Methods are needed to reduce the contents of emerging environmental pollutants such as surfactants and microplastics. Also, further studies are needed to determine design criteria (particle size distribution, depth of media, residence time, temperature, etc.) for different types of pollutants, existing and emerging. Finally, further research is needed to advise on life cycle time, operation (e.g., batch or continuous flow), and maintenance procedures (cleaning of media, back-flushing, etc.) for used porous media in slow the sand filtration.

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“…The most commonly used plant species for starch extraction are corn, cassava, potato, rice, yam and plantain. Unmodified and modified starch has been used to develop various biopolymers for food packaging, artificial muscles, pharmaceuticals, water treatment, among others [19,[21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Valorization of cashew nut processing by-product: development of a cardol/starch biopolymer composite with electrochemical properties and technological potential

Arrieta

Ducuara

Combatt-Caballero

2023

EEJET

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The problem of food agro-industry residues represents a growing concern in our society, therefore its use as a raw material to obtain biopolymers of technological interest is an attractive alternative. The objective of this work was to assess the viability of utilizing cardol, derived from cashew nut shell liquid, in the production of a biopolymer composite by combining it with cassava starch. The biopolymer composite was prepared by thermochemical method using different cardol concentrations and varying the synthesis pH. The results allowed us to demonstrate the formation of cardol/starch biopolymeric films. The infrared spectra showed possible interactions by hydrogen bonds between the cardol and the glucose units of the starch. The impedance behavior showed a similar conduction mechanism in all cases, allowing the establishment of a single equivalent circuit. The electrochemical parameters showed that the presence of cardol and the lower pH increased the values of the electrical resistance and the double layer capacitance in the biopolymers. In addition, the values of the CPE/Rre system, related to the electractivity, were not affected by the pH, but by the presence of cardol. The biodegradability tests showed a complete decomposition of the biopolymer composite films in three stages in a period of 17 to 19 days. It could be concluded that it is possible to use the cardol extracted from the cashew nut shell liquid to elaborate a biopolymer composite with electrochemical properties when combined with cassava starch. The electrical properties of the biopolymer can be modulated by varying the synthesis pH and the amount of cardol used. The composite cardol/starch biopolymer could be used as a biopolymeric solid electrolyte in the manufacture of batteries, capacitors, etc

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Synthesis of starch‐based flocculant by multi‐component grafting copolymerization and its application in oily wastewater treatment

Cited by 5 publications

References 64 publications

Review of Slow Sand Filtration for Raw Water Treatment with Potential Application in Less-Developed Countries

Review of Slow Sand Filtration for Raw Water Treatment with Potential Application in Less-Developed Countries

Review of Slow Sand Filtration for Raw Water Treatment with Potential Application in Less-Developed Countries

Valorization of cashew nut processing by-product: development of a cardol/starch biopolymer composite with electrochemical properties and technological potential

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